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A linear circuit is an electronic circuit which obeys the superposition principle. This means that the output of the circuit F(x) when a linear combination of signals ax1(t) + bx2(t) is applied to it is equal to the linear combination of the outputs due to the signals x1(t) and x2(t) applied separately:
It is called a linear circuit because the output voltage and current of such a circuit are linear functions of its input voltage and current.[1][2][3] This kind of linearity is not the same as that of straight-line graphs.
In the common case of a circuit in which the components' values are constant and don't change with time, an alternate definition of linearity is that when a sinusoidal input voltage or current of frequency f is applied, any steady-state output of the circuit (the current through any component, or the voltage between any two points) is also sinusoidal with frequency f.[1][4] A linear circuit with constant component values is called linear time-invariant (LTI).
Informally, a linear circuit is one in which the electronic components' values (such as resistance, capacitance, inductance, gain, etc.) do not change with the level of voltage or current in the circuit. Linear circuits are important because they can amplify and process electronic signals without distortion. An example of an electronic device that uses linear circuits is a sound system.
- ^ a b Maas, Stephen A. (2003). Nonlinear Microwave and RF Circuits. Artech House. p. 2. ISBN 9781580536110.
- ^ Wing, Omar (2008). Classical Circuit Theory. Springer Science and Business Media. pp. 12–14. ISBN 9780387097404.
- ^ Chen, Wai Kai (2004). The Electrical Engineering Handbook. Elsevier. pp. 4, 12, 75–76. ISBN 9780080477480.
- ^ Zumbahlen, Hank (2008). Linear circuit design handbook. Newnes. ISBN 978-0-7506-8703-4.